“Source Serif is an open-source typeface for setting text in many sizes, weights, and languages. The design of Source Serif represents a contemporary interpretation of the transitional typefaces of Pierre-Simon Fournier. Additionally, Source Serif has been conceived as a friendly companion to Paul D. Hunt’s Source Sans.” — Adobe
First released in 2014. Version 4 from Jan 2021 spans 6 weights in 5 optical sizes, in roman and italic, with support for Latin (Adobe Latin-4), Cyrillic and Greek. Designed by Frank Grießhammer, with contributions by Reymund Schroeder, Emilios Theofanous, Thomas Thiemich, and Irene Vlachou. See the specimen page for full credits.